Move image render functions into pages (#291)

Move image page renderes into seperate files

src/ui/images/pages/steam_images_overview.rs

@@ -0,0 +1,14 @@
+use crate::ui::images::{useraction::UserAction, gametype::GameType, image_select_state::ImageSelectState};
+
+pub fn render_page_steam_images_overview(ui: &mut egui::Ui, state: &ImageSelectState) -> Option<UserAction> {
+    if let Some(steam_games) = state.steam_games.as_ref() {
+        for game in steam_games {
+            if ui.button(&game.name).clicked() {
+                return Some(UserAction::ShortcutSelected(GameType::SteamGame(
+                    game.clone(),
+                )));
+            }
+        }
+    }
+    None
+}